True (except these are actually .136 -.140, not .125), but stiffness also depends very much on the structure/shape of material. The ARB transmission skid, for example, has a box structure that makes it much stiffer than a comparable plate. Or even a plate twice as thick, probably. Also, a big company like ARB, would've performed the proper structural analysis/FEA in the design of their product, or at least I would've expected them to, whereas some of the other skid manufacturers seem like they're just making stuff in their garage, with no engineering involved. :shrug03:Lol that's very true, good skills always beat over built gear. My line picking is definitely not good enough and my skids are pretty bashed 😄
As to the thickness vs strength, the difference is not trivial. For a quick simplified look, in bending, stiffness is proportional to thickness cubed. So for 0.1875" vs 0.125", stiffness is (0.1875/0.125)^3=3.375 times. For 0.25" vs 0.125", it would be 8 times as stiff.